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2 protocols using poly ethylene glycol bis carboxymethyl ether

1

Graphite-based Functionalized Nanocomposites

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Graphite powder, ethanol, iron (III) chloride hexahydrate 98% (FeCl3⋅6H2O), N-(3-dimethylaminopropyl-N′-ethylcarbodiimide) hydrochloride (EDC), N-hydroxysuc-cinimide (NHS), sodium acrylate (CH2=CHCOONa), sodium acetate (NaOAc), ethylene glycol (EG), triethylamine (TEA), diethylene glycol (DEG), thionyl chloride ≥99% (SOCl2), dimethylformamide (DMF), methylene chloride (CH2Cl2), sodium azide (NaN3), hydrochloric acid (HCl), poly(ethylene glycol) bis(carboxymethyl) ether (average Mn 600) (PEG), sodium nitrate (NaNO3), hydrogen peroxide (H2O2), sulfuric acid, acetone, citric acid, and potassium permanganate were procured from Sigma-Aldrich Co. (St Louis, MO, USA). CUR was purchased from Pakhsh Razi Co., Ltd (Tehran, Iran).
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2

Synthesis of Rare Earth Fluoride Compounds

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Rare earth (RE) oxides: Er2O3 and Yb2O3 (99.99%, Stanford Materials, United States) were dissolved separately in hydrochloric acid, HCl (ultra-pure, Sigma-Aldrich, 37%, Poland) in order to obtain respective rare earth chloride solutions in a concentration of 1 or 0.25 M. Ammonium fluoride, NH4F (98+%, Sigma-Aldrich, Poland) was used as the source of fluoride ions. Strontium chloride hexahydrate SrCl2·6H2O (Sigma-Aldrich, 99+%, Poland), citric acid trisodium salt dihydrate, (Sigma-Aldrich, 97%, Poland) and ammonium citrate tribasic, (Sigma-Aldrich, ≥97%, Poland), phosphate buffered saline (BioShop), poly(ethylene glycol) bis(carboxymethyl) ether (average Mn 250, Sigma-Aldrich, Poland), polyacrylic acid (average Mw 1800, Sigma – Aldrich, Poland) were used as received, without further purification. Deionized water was used for the synthesis.
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